Fix type in gpt2 config docstring (#21782)

Fix docstring gpt2 config

src/transformers/models/gpt2/configuration_gpt2.py

@@ -65,7 +65,7 @@ class GPT2Config(PretrainedConfig):
             Activation function, to be selected in the list `["relu", "silu", "gelu", "tanh", "gelu_new"]`.
         resid_pdrop (`float`, *optional*, defaults to 0.1):
             The dropout probability for all fully connected layers in the embeddings, encoder, and pooler.
-        embd_pdrop (`int`, *optional*, defaults to 0.1):
+        embd_pdrop (`float`, *optional*, defaults to 0.1):
             The dropout ratio for the embeddings.
         attn_pdrop (`float`, *optional*, defaults to 0.1):
             The dropout ratio for the attention.